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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb50b13fd54913c5e25739911f08c15187c31206daa7151391dad5f8a684a2b' 
  AND token = 'CrZl7cjKloHe7Ubjq60X26CX77lbArNG23MWh0VT5dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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