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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9c7ca483cc403f38a2c731bf97ad316de49f2012da2eb307a50b17310a9ca4' 
  AND token = '/Dj3Tz9PqKOtoVScgbXy699GXjzlRN6ITHOPR+0mt+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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