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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7508e218f554bf3469a7de5a3362584568ee78c212b9ee57314dc17fd12ca596' 
  AND token = 'o7CyTWJfx6eFU9OkN4NpKEumpG9CTM7Zn02Mxi8zXSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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