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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ea03fe96a9f6c25cd2c9a0e7dc09455e5f91a3d100da630452fbbdc63d9ae' 
  AND token = 'uuGolaK5fS55b9G1cKMSMmkBrpcvibnvqa/EMxeeelY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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