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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac25f7c97c9c07458003b5c451ebf2bd5ea3600e9c776c1f64c814d894bc9a5' 
  AND token = 'SODNwmeAPjojEYNNg1xWyQph0OB2dW73VuaZZck1rQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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