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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203c0f133455ea31312c77079e528d27d85d4890b97d17b75d15efa969db2ad7' 
  AND token = 'HprW/5JUYWlpXZDxBED5Tsiu81HfJfmtkHAVtavILD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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