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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012e423fdcf2cbaa137a378eaa241a610d9d27104a9dce5148af7abace525fe9' 
  AND token = 'SPi5BstnW+Yc5AtIttMSaTw4RHJLq2bTGAuC85u9h+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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