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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204a802eb6300422ff9beb04cf9f05e3c2f96eeb8545a27d23c4a9e7c55c59df' 
  AND token = 'URubWZbFrrYYr+fmnv24G5oWc54ScXJVZjBo9ImNrZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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