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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee75846ab087dc71ad9254c14d60c3c8167203e1c5836cb2299340fc7cec323a' 
  AND token = 'ot1kI4JMYV2NwehWQfcXSnzrINcRu7+1IbsvraITmyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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