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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffd80ca78454e3fde01261b3a9b1ad6be6de84b889f1513a3491ff058711dfd' 
  AND token = 'tpn/xnqwqNZ5GkP9DTQ3gFfD5EDyi3D7grefxv4aB1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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