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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506f0c41f3171549a084d9a31a02801144c77060e7e829c3d6e694a7370fd08c' 
  AND token = 'uaHZmMAL6eHag/bz/QgDqentj3wSeIv3XJafaetxYpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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