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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b4a53e8bb8970a8e89415ab055ef1261e0b3cd08795aec1195c7777ca23a94' 
  AND token = 'aVylTtEIWfYM1a3QhDoziPgR5L5JtB63dxpKmmzqPoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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