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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b238fd123e59b044bdc0862a22e32cc2c846068b8a1f9cd6340490a124064e3d' 
  AND token = 'X9ZbWFwjrc3QYszA9TCofz9imOiRabEOuyOqabt6D0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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