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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a88cd2601b70cc0c40a3e5a966f17f78bc16c771c61e291babcfd4f464bada' 
  AND token = 'Or7m30T7MKmHgmiNDKRYtahWEt8mWEKK1wfEKzt5pxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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