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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48480d26dbd066c03dc737eff3206563d45dc6fb66a6f5c0b190d93a4c166444' 
  AND token = 'NjcKm2T0o4xoJL8Yzy3HTFxdANdKMnaY3nzhLwO5400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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