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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd30bb986114ab677130b159d8211378521cc6b5041d7bd18d0ef21832ca690e' 
  AND token = '6SnAKCrd6UIZ8wrnvlFRhWBRLILZDkuYslDILpJ8Lkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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