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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ab0e7008619a12ddfced3f1754ae2cf817bfc4e064dc656b63212ea7fa1b83' 
  AND token = 'po+XbIAsIDmCUX9RHLwEjpckkDIxeaCP4qxjT9ADw2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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