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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f787496c96b34443aa4b9effe68a1a0405d958bd5b3f3da79b09a93eff90bd2' 
  AND token = 'K0grpnr9B6Jb26Qs5Rvyi6hSlMLnHZfd11m5EJIw/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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