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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c2993326ea6400a2fb8d94dd2b9434050efd6888d490fb5a675e0f25065b37' 
  AND token = 'zrHn4HNZOuYbG7AATOvSngA8ejP/FLDeqpdMxIFiTcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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