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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d60cdb105f00bc7be4f80ce332b8066ab96174dcaf967d0c4ecc36f3691d1e5' 
  AND token = 'tpZLxDaCfpqMKYqCDQwGm5CfAt1ZnWYQ3JLf1d4qW2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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