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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd3dd7aa78e1e70fa0bc2ee5254892c09246c49b649356f7f5b10ad2df5e3fa' 
  AND token = 'Mishk2hLYhmyThnk2g+Z8N9LCKF3VptVIzMfdTc+DsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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