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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda2f457b866d6e879691e3c6305aee4c370ca5976846a8f307715bedf7d0900' 
  AND token = 'WSJxcffOkMzSleL6TDD9UF4g8Z1wxNBaE9mkYEpQIh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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