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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53238f7a595617f3cf8eabac74fd123716a5be0fa0c4aa39656d18a51da3ee6' 
  AND token = 'sTk1Es36ee3QR+mV8i9WAXsYSmrxYz+5v3TVE+XkkKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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