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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29af106bbcdc7cb569c01a7e5a2166d4f0d5de73ce29b24d926b6d1570ed1719' 
  AND token = 'scxWi4NjXBbjK3NG7DTH2M01FqQYCha1FWFffbC0jxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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