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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ccd3ee5301be5f749e3bd80a76bc1c215be19b7f5f03066f2e67290f0d5b49' 
  AND token = 'HnjUBYtWi10nlsld0kFv15rNpF6JdMF8xXdaqIAeJp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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