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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238424033812e5c5cfbb47d3151c5a9ccede3ac95cd0b5432debc1adff93e505' 
  AND token = '5bWl+jE1Hvp44q2H9ReNYmBuY85G9CDPABxohLah1W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}