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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f61e338ec6640619d2340ba3a3950039661f9acc0fe31199c55f76c5706b587' 
  AND token = 'Krgoc22HPLPWs1XYwtaIxQwqiFWfM7epxFzDg5tWW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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