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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d5ee95afbcd44431b4fe10d0fad3652e454e5960f97d20d81205cdab88e7ff' 
  AND token = 'SIueZ8W3ERCp+YsQJRzdG6iUhX7gnPI/kz3TyYwc4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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