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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7283f618cff5b111e94346a5b0109ecdc2105e3d92b120faeb83e96e3eb6a07' 
  AND token = '/tPe/sf8xA1dipNz/9N4BA62QbwybDeSymdNZquH148=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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