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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9acc48962119383c802fba9e5516e9c6e83ffff7d8ce8fa9413dc72d6844a1' 
  AND token = 'W6eBmsXmjkWRVei7Zr059RGHgyLj9SMnn6ZWHQR5+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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