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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866201a46ba22ead6f7b9dfa19a80747ff96d0a0b083233426d19c0e77deceec' 
  AND token = '9nsZU4OgeoOX/JSTWfjTfdcBJav9Xo5cFcYDhn/IUpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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