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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b254b9902cc6d0859e4f95095195523e55716313cd685913a2310b4e44cf9d' 
  AND token = 'EJqZuVpMAjHoUFk1dPVSZTWeKi0M35euyeNFZwDcVDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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