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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f685081d847962e857f8e0a95625a7308bebf7b994c213c836205b7cbb1979' 
  AND token = 'QAPjMFTy6YtX4XrHS0g5ze8dFCFbBu7gpYH6SEt+bMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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