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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bfddadcba8ef88f3443c1dd0ef41798e25e04b7549cae29476da0452c166b1' 
  AND token = 'Hje3N/L7OPtBkP7l9NXPBD0CvWh0TUhzy8dhUuVafT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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