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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fbcb01e9e3a858f051ba6ec2b67924114b50b2183fd6648e305dd6b5eb2236' 
  AND token = 'okK/rHf5fvXhyX7lDv1uB4F2KoLBuhuoouegD3xDUvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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