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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c5eb0faa6003bf07b942eb023f4f6f7450870e24b02dfb545a5d2233b2889b' 
  AND token = '1OMZ06NX3Xkgs9wdlfKQZlxrVekNbU9dy4cKRMv86gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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