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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7edc94f9b1e1c0ff3c63fecbb21d5e19414f9b8a4f66843f8fdf33c18f7f94' 
  AND token = 'YDogb/nFrxQojc/YOrCusKPfu2K1zs/asnGZNqk2wDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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