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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a968b44ae0bfec02f4168d5ebef416c79e07b8f780c1096a93e017134a469f9' 
  AND token = '1N+9fQWRZmoPmQ45s+9Dnri6I5clY3/ichoGX5+941w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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