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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38974054ed8d8a57a6e57769b3b2cb7449ac5e28449119ef1ee02c288c4dab3' 
  AND token = 'jojz9SVVmlL51PHgImmE7A87sVKPXO2Ptkjhb2A7Zmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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