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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37a6bb75649ed1be201b59f45db6ec9e51f78dba660c502c4cf2b2c92a0f75c' 
  AND token = '8jPy8ebK11OX1iTgbVyot1Yogjr0b9PvKot7aXKCUvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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