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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bf98e188b764ac196c00b5aff087f2f6e05830fddd3c63629e4be5d5f51f23' 
  AND token = 'TxrZ+T3KamUI2REQ712d1StP/h7f8/TemRIHBVafKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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