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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b927b7c886e28bba2dd72119e65f35dc6c6574d1376c59d3956c035831b572' 
  AND token = 'gOdTQOLHf6th3hgUWbh3PAjfMyHVw2v6DvtYNfC4Ik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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