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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e761828d3cf389bd59208c1a697d8d770743c76c286e69dbdd24fcd36a8cb258' 
  AND token = '8JWyYQMrjOXaFUIeuzLRrNqW6FXLco1CClAXqJjm8k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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