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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dd959948009f77b03298f50a84ed4d9c1df5ac44122b8c3c906e8fe50eaa3c' 
  AND token = 'T7Xb+TXmAtcWQDl7SVe/abI3/YwNcJw3Szid/Sm7C7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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