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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099253941e6be7f7e22ddc197caa83c72f0505b7789760fe767da5b023d52c36' 
  AND token = 'eppCBL3hv/9+FRKKurp0A9Wh/2yjBNUQZeJXa0QivbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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