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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c74b70820012b94e9bb929b00f7b737ace7a623f784f0eed7a9db00876eefcf' 
  AND token = 'FkwTUqWDjk+Ck5hqIoQLQaZeMDXDvEloNU8JYJDv+vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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