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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611c615c9b1f6ef282f65fcd205307c44fb6f1facebb5463d69926528a159487' 
  AND token = 'CH3tUdWkyTGHKG3HjePnzZJ9jiDSKxtbrGPZDQ94TVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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