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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda0b9e7aacc8054eeed9fcfdc6522b75bc72cd54332db9fdda38ff787567725' 
  AND token = 'Cfglm/B59rguXWKt4HWS60a7q7AN6tzaVgoYAf0NWfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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