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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd3dd623304063a946c20c9e485fe2a024a01ad1ff859c80ac337a4a16b6c3d' 
  AND token = 'eAT/VbGAJrdSpTUP1i+jbE1W+PiEdTNOHTA2RMK2X8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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