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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fca53cb6c3ed8bd559f4e7ec94a752e8f3c9e7c556813cf12c47380c96eaad' 
  AND token = 'KVndBhGbghGb40cpVTk8BDs+0BlNwEEdTOoEjPi9GCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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