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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9347763b3d5a5f4497ce9dcd09903477d3d8edff860e4768ec98c594ab0176' 
  AND token = 'U42jwbvl7T1w+W+RU33iS5NCcmgqcMhlBSejNEn8I8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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