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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45c8313b1ed1399b15c3b62cb7d26b242db41906d14c5e03a328759cc2252cd' 
  AND token = 'AVS5/i3tzpn2Ik2NbppBNKy/u15/apXVmEGBHLO1QNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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