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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6861a880686c8128cebad15884999b485df52e34920611e93daf06e0ed6203' 
  AND token = 'K0wvsTbolobVwgvFvStpv2TIQyRDaDnBAus+pvUO1YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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