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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66348b89c764fd9a9f257a24ed05b5bfeaf7329db9acff11fba8957b51cd2423' 
  AND token = 'd6OMV8wmn/o9ke5nA1yS1BLoGa/s/ox57mQPts4UAPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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