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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b636668e4c5bb768dcc184ea190cdff208527003aeba7d45cd33bbeee57909b8' 
  AND token = 's9QhTTbh2Z/Xqcp3MAY83TWaFIIZEsPTCJ+kysND2ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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