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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b934e4d9d61712e044d5cce309ede776ede2604897dd1712c37134f0cca59a74' 
  AND token = '5ZiQQhu6kzeHbsWDhAr6kgpI8p/ZeNDHf4H1I+c2Kmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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