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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec94513d8cbee14922e3f2d68280400a45cb76cb099e94bee93244f173b80267' 
  AND token = 'EUD5k7u7GPe8fGNR7Hc/w5bg0wSTsdnTeFTNREFH8D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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