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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeafa13dbfcfa63b3b43708d7123c304816cc943277e04ebfacb22372d02da3' 
  AND token = 'Dkqya9CxdRFx8ayvsPPqCh6/C2rXDcvqE47Gr/r8+Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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